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Item _space_group.IT_number

Description

              The number as assigned in International Tables for
               Crystallography Vol. A, specifying the proper affine class (i.e.
               the orientation-preserving affine class) of space groups
               (crystallographic space-group type) to which the space group
               belongs.  This number defines the space-group type but not
               the coordinate system in which it is expressed.

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Mandatory Code

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